The document details the custodial history and organization of exhibition announcements collected by Meyer Schapiro from 1920 to 2001, including his original categorization by artist. It highlights the importance of these materials for provenance research in the art world, particularly in tracing the history and legality of ownership of artworks. The document also discusses a specific case study involving André Masson's painting 'Pasiphae' and the complexities of verifying its exhibition history and provenance.